"clearing" the state of an org-mode subtree

[Robert Goldman <rpgoldman@sift.info>]

I'm at about my one year anniversary using Org-mode, and I have a bit of
an odd question.  Last year, I made a subtree that was a project for
getting ready for winter (I live in Minnesota, which has harsh winters).

I worked my way through that list, and now I'd like to do the whole
thing over again.

So I'd like to copy the subtree (this I believe I can easily do), and
then clear it.  That is, I'd like to reset all the TODOs from DONE to
TODO, and clear all the check boxes.

This seems like a really odd thing to do, so there probably isn't
automation for it, but before I go groveling over it by hand, I thought
I'd ask.

thanks!
R